WO2011145188A1

WO2011145188A1 - Acoustic-feel adjustment device

Info

Publication number: WO2011145188A1
Application number: PCT/JP2010/058448
Authority: WO
Inventors: 秀和古澤; 泰也窪田
Original assignee: 株式会社ハウス119
Priority date: 2010-05-19
Filing date: 2010-05-19
Publication date: 2011-11-24

Abstract

The disclosed acoustic-feel adjustment device can appropriately adjust how sound reflects above a sound source, providing an acoustic feel close to that of a high-ceilinged space without large-scale engineering work such as the provision of sound-absorbing materials on the ceiling. A sound-absorbing body (10) supported by a mount (20) is provided above musicians (80) or other subjects, in the middle of a propagation path by which sound from a sound source such as instruments (70) reflects off the ceiling (50) of the room and returns to the aforementioned subjects. Said sound-absorbing body helps prevent a state in which sound emitted from the sound source reflects off the ceiling (50) and then returns as is to the subjects. The manner in which and degree to which sound reaches the subjects from above is thus made similar to that in a space with a ceiling significantly higher than that of the aforementioned room. Even in an ordinary indoor space, the subjects can thus be provided with an acoustic feel that is extremely close to that of an actual performance space with a high ceiling, such as a hall. Consequently, even in a room with an ordinary structure, subjects practicing for an instrumental, vocal, or other performance can be provided with a practice environment that differs little from the actual performance space, making the actual performance feel more comfortable.

Description

Sound field adjustment device

[Technical Field] The present invention relates to a sound field feeling adjusting device in which a sound absorbing portion is positioned above a head of a person such as a musical instrument player or a singer to change a human sense based on reflected sound from above.

When a musical instrument player practices a performance or a singer practices a singing for a concert or a presentation, it is important to practice in a performance hall such as a hall where performances and singing are performed. It is most desirable to accurately grasp the spread of the sound (musical sound / voice) generated by the singer and the echo state of the generated sound in the hall, etc., but the opportunity to practice at the convenience of the performer etc. in such a hall Since it is extremely difficult to set up, practice is usually performed in a room having a general structure such as a smaller practice room.

However, when practicing repeatedly in an indoor space where there is no particular consideration or countermeasure for sound reflection in the space, amateur players, etc., practice only in a narrow indoor space in a typical house. In this case, the sound field feeling felt by the performer or singer based on the acoustic characteristics of the room space is accepted as the sound field feeling at the time of performance and singing and is used to this. When demonstrating performances and singing on the ground, the difference in sound field feeling due to environmental changes from the time of practice not only makes the player or singer feel uncomfortable, but also creates a sense of insensitivity to the sound. The problem of being unable to perform and sing was caused.

For this reason, in a room that is expected to be used for musical instrument players and singers to practice performances and singing, it is possible to suppress reflection of specific sound in the room space of a room that is significantly narrower than a hall or the like. For this reason, it has been proposed to provide a sound absorbing structure by arranging a special sound absorbing material on the ceiling or the inner surface of the wall to suppress unnecessary reflection. Among those used for such purposes, there is one disclosed in Japanese Patent Laid-Open No. 2001-132132 as an example of a sound absorbing plate disposed as an interior material for a ceiling or wall in a room.

By forming walls and the like using the conventional sound absorbing plate, it is possible to prevent excessive reflections from occurring due to the narrowness of the room, and to make the sound field feel special during practice. It is possible to make it difficult for the performer to feel uncomfortable at the time of the performance by suppressing the additions as much as possible.

JP 2001-132132 A

A conventional sound absorbing plate for making a sound absorbing structure on a wall or the like in a room has a configuration shown in the above-mentioned patent document. By providing it as a ceiling or wall facing the room, sound generated from a sound source such as a musical instrument can be obtained. In order to achieve sound absorption performance and suppress sound reflection, however, in order to produce an appropriate reflection suppression effect, the sound absorption plate is replaced with existing ceiling materials and wall materials over a wide range of room ceilings and walls. It is necessary to provide a sound absorbing plate or add it to the indoor space side of the ceiling or wall. When such a sound absorbing plate is used to make a sound absorbing structure on the ceiling or wall, the work of fixing and mounting the sound absorbing plate to the ceiling becomes particularly large, and there is a problem that a large cost is required.

In addition, in order to demonstrate the sound absorption performance, the sound absorption plate is fixedly installed on the ceiling or wall, so it is not possible to finely adjust the sound absorption or reflection state later. When trying to make adjustments so that a close sound field can be obtained, it is necessary to add another sound absorbing material etc., especially for the ceiling, it is difficult to flexibly respond to the situation Also had.

The present invention has been made to solve the above problems, and appropriately adjusts the reflection state of the sound from the sound source without a large-scale work of disposing the sound absorbing material over a wide range of the ceiling. Providing a sound field adjustment device that can suppress the effect on the sound field feeling due to the reflection of sound peculiar to a narrow room and can give the sound listener a sound field feeling close to a high ceiling space such as a hall The purpose is to do.

The sound field feeling adjusting device according to the present invention is configured so that a sound from a sound source is set between a ceiling and a floor in an indoor space in a direction parallel to the floor or inclined within a range of ± 30 ° from the direction. A substantially plate-like sound absorber disposed above the head of the subject to be listened to and disposed in the middle of the shortest propagation path until the sound from the sound source is reflected by the ceiling and reaches the ear of the subject; It includes at least a gantry that supports the sound absorber from below.

As described above, in the present invention, the sound from a sound source such as a musical instrument is reflected on the ceiling, and is in the middle of the propagation path until reaching a target person who listens to the sound from the sound source, such as a musical instrument player or a singer. The sound absorber supported by the gantry is placed at a position above the target person, so that the sound emitted from the sound source is reflected from the ceiling of the room and reaches the target person as it is. The reflected sound reaching the target from the sound source is limited to the amount of reflected sound that is not reflected at all, or the sound from the sound source is reflected slightly on the lower surface of the sound absorber, so that the sound reaches the target from above. By making it similar to a space with a ceiling that is considerably higher than the room, the difference from the performance hall such as a hall is large, and the reflected sound from the low ceiling in the general indoor space, which was a factor that made the subject feel uncomfortable The sound field is based on a high ceiling It can be given to the subject instead of the sound field feeling very close to the demonstration hall such as the hall, etc., and it is related to the subject's performance and singing practice, etc. Can provide an excellent practice environment, and can eliminate the sense of incongruity during the performance, leading to improved performance during the performance. In addition, when installing in an indoor space, it is not necessary to renovate the room on a large scale, and it can be introduced simply and at low cost, and the sound field can be easily and easily moved by moving the position of the sound absorber relative to the subject. It is possible to adjust, and it is possible to easily improve the environment for listening to the sound of the subject and obtain an appropriate sound field feeling.

Also, in the sound field feeling adjusting device according to the present invention, the sound absorber is arranged so that the inclination angle can be adjusted as necessary.

As described above, in the present invention, the inclination angle of the sound absorber disposed above the subject can be adjusted, and the reflection state of the sound from the sound source on the sound absorber by adjusting the inclination angle of the sound absorber, That is, by changing the arrival state of the reflected sound to the target person, the sound field feeling received by the target person can be finely adjusted based on the reflected sound from the sound absorbing body, and the sound absorbing body according to individual differences for each target person can be adjusted. With fine adjustment, any audience can be given a desired sound field feeling, and the sound field feeling can be finely adjusted assuming the performance field scheduled for the demonstration, creating an environment that supports various performance situations. Can be provided.

Further, the sound field feeling adjusting device according to the present invention may include one or a plurality of sound absorbing members different from the sound absorbing body at a position corresponding to a rear portion and / or a side portion of the target person in the gantry as necessary. The body is detachably installed.

Thus, in the present invention, apart from the sound absorber at the top of the gantry, the sound absorber is arranged at the back and sides of the subject with the gantry supported by the gantry, and the sound absorber is also used for reflection on the back and sides of the subject. By changing the reflection state and adjusting the arrival state of the reflected sound to the target person, the influence of the reflected sound from the wall is suppressed, and the target person's sound field feeling is further demonstrated in the hall, etc. It can be in a state close to.

Moreover, the sound field feeling adjusting device according to the present invention is arranged, if necessary, on the rear part and / or the side part where the pedestal does not come into contact with the subject and the accessories handled by the subject. It is attached to the upper part of.

As described above, in the present invention, the pedestal is arranged at a position away from the subject and its accessories, and the subject is instrumental as a performer by attaching the sound absorber to the upper portion of the pedestal and positioning it above the subject. When the singer is played, the pedestal does not become an obstacle to performance, and the sound absorber is supported by the cradle without any particular problem, and the adjustment of the sound reflection state by the sound absorber can be appropriately executed.

It is a front view of the sound field feeling adjustment apparatus which concerns on the 1st Embodiment of this invention. 1 is a side view of a sound field feeling adjusting device according to a first embodiment of the present invention. 1 is a plan view of a sound field feeling adjusting device according to a first embodiment of the present invention. It is a side view of the 1st modification of the sound field feeling adjustment apparatus which concerns on the 1st Embodiment of this invention. It is a side view of the 2nd modification of the sound field feeling adjustment apparatus which concerns on the 1st Embodiment of this invention. It is a top view of the 3rd modification of the sound field feeling adjustment apparatus which concerns on the 1st Embodiment of this invention. It is a front view of the 4th modification of the sound field feeling adjustment apparatus which concerns on the 1st Embodiment of this invention. It is a top view of the 4th modification of a sound field feeling adjustment device concerning a 1st embodiment of the present invention. It is a perspective view of the sound field feeling adjustment apparatus which concerns on the 2nd Embodiment of this invention. It is a front view of the sound field feeling adjustment apparatus which concerns on the 2nd Embodiment of this invention. It is a top view of the sound field feeling adjustment apparatus which concerns on the 2nd Embodiment of this invention. It is a graph which shows the time waveform and the frequency component of the sound in the player position at the time of the guitar performance in the indoor space which provided the sound field feeling adjustment apparatus of this invention. It is a graph which shows the time waveform of the sound in the player position at the time of the guitar player in the indoor space which does not provide the sound field feeling adjustment apparatus of this invention, and its frequency component. It is a graph which shows the time waveform of the sound in the player position at the time of the piano performance in the indoor space which provided the sound field feeling adjustment apparatus of this invention, and its frequency component. It is a graph which shows the time waveform of the sound in the player position at the time of the piano performance in the indoor space which does not provide the sound field feeling adjustment apparatus of this invention, and its frequency component.

(First embodiment of the present invention)
Hereinafter, the sound field feeling adjusting apparatus according to the first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an example of an instrument that is supported by a floor such as a drum set and that has a musical sound generation site relatively close to the performer and an apparatus that is arranged corresponding to the performer will be described. .

In each of the drawings, the sound field feeling adjusting device 1 according to the present embodiment plays the musical instrument 70 with a direction inclined at a predetermined angle from a direction parallel to the floor 60 between the ceiling 50 and the floor 60 in the indoor space. And above the head of the performer 80 as the subject, and at a midpoint of the shortest propagation path from the sound 50 from the instrument 70 as the sound source to the sound reflected by the ceiling 50 and reaching the ear of the performer 80 This is a configuration comprising a substantially plate-like sound absorber 10 and a gantry 20 that supports the sound absorber 10 from below.

The sound absorbing body 10 is formed as a substantially plate-like body having sound absorbing properties, and is attached to the upper portion of the support column standing upright substantially vertically of the gantry 20 by being inclined by 30 ° from the direction parallel to the floor 60. It is the structure arrange | positioned above. With respect to the sound absorbing property of the sound absorber 10, a known structure including a plate having a large number of holes drilled and disposed on the surface, and a porous sound absorbing material disposed on the plate is provided. The detailed description is omitted.

The height at which the sound absorber 10 is disposed is about 200 to 300 mm or more above the head of the performer 80 in the standing or sitting position so as not to give a feeling of pressure, The range needs to be within the room without being in contact with the ceiling 50, and is preferably about 1500 to 2000 mm, for example.

In addition, the size (area) of the sound absorber 10 needs to be set according to the distance from the player 80 so that the sound field of the player 80 can be appropriately adjusted by appropriate sound absorption. This area can be reduced if the player 80 is approached, but conversely, if the player 80 is provided away from the player 80, the area increases. From the viewpoint of workability for mounting the sound absorber 10 on the gantry 20 and realistic conditions such as the strength and size of the gantry 20 that supports the sound absorber 10, the width of the sound absorber is about 600 to 900 mm and the depth is about 600 to 1800 mm. It is preferable to set to. However, the optimum value of the height, size, and inclination angle of the sound absorber 10 varies depending on the structure of the room, the sound pressure of the sound emitted from the sound source, and the subject such as the performer. Therefore, it is necessary to adjust to an appropriate state.

The sound absorber 10 is supported so as to be positioned above the head of the player 80 with respect to the musical instrument 70 as a sound source, so that the sound from the musical instrument 70 is temporarily reflected by the ceiling 50 and played by the player 80. The sound absorber 10 is located just in the middle of the shortest propagation path when reaching the ear of the user. The sound absorbing action of the sound absorber 10 absorbs the sound going to the ceiling at the lower surface portion of the sound absorber 10 in the middle of the propagation path, or the sound reflected by the ceiling is absorbed by the upper surface portion of the sound absorber 10 in the middle of the propagation path. As a result, the arrival of the sound from the ceiling side, that is, from above, to the player 80 is greatly suppressed.

The gantry 20 includes a support column 21 that stands substantially vertically and a lowermost pedestal portion 22 that supports the support column 21 and is attached to the top of the support column 21 with the sound absorber 10 protruding forward. The support column 21 and the pedestal portion 22 do not come into contact with an accessory handled by the performer 80, such as the performer 80 who is a person who adjusts the sense of sound field, the musical instrument 70 and its supporting equipment installed in the vicinity thereof, that is, The support column 21 is positioned behind the performer 80, and the pedestal portion 22 is positioned on the left and right sides of the performer 80 and the musical instrument 70, respectively.

In addition to the uppermost sound absorber 10, a plurality of sound absorbers 11 are arranged in a standing state along the support column 21 at the front surface position of the support column 21 on the rear side of the player 80 in the gantry 20. This is a mechanism for changing the sound reflection state behind the 80.

The pedestal portion 22 is sufficiently long to extend from the support column 21 at the back of the player 80 to the front side so that the entire pedestal 20 does not fall with the sound absorber 10 attached to the top of the support column 21. The center of gravity of the upper part of the gantry is secured so as not to be located in front of the pedestal part 22. A plurality of casters 22a may be provided in the lower portion of the pedestal portion 22 to facilitate movement and position adjustment of the apparatus with respect to the floor.

Next, the installation and use state of the sound field feeling adjusting apparatus according to this embodiment will be described. As a premise, for the side and front of the musical instrument player 80 who is the target of sound field adjustment, a sound absorbing material is placed in advance on the wall of the room, so that the reflected sound on the wall is unique to the room. Measures shall be taken so as not to be in the state of a defect.

First, in the vicinity of the performance position of the performer 80 as the target person, the support column 21 and the pedestal portion 22 forming the pedestal 20 are disposed at positions where the performer 80, the musical instrument 70 as the accessory, and the supporting device thereof do not come into contact. To do. Specifically, the pedestal portion 22 is disposed at a position from the left and right sides of the musical instrument 70 on the floor surface to the back of the performer 80, and the column 21 is placed on the back of the performer 80 on the pedestal portion 22. Is disposed. Furthermore, if the sound absorber 11 is mounted in a standing state on the front surface of the column 21 and the sound absorber 10 is mounted and fixed on the upper portion of the column 21, the sound field feeling adjusting device 1 can be handled integrally. In this state, the player 80 moves the position of the entire apparatus while making the sound of the instrument 70, and finely adjusts the position of the sound absorber 10 with respect to the player 80. In a desired state.

When the player 80 plays the musical instrument 70 with the sound field feeling adjusting device 1 provided, the sound generated from the musical instrument 70, which is a sound source, diffuses to the surroundings, and the direct sound reaches the player 80. Each of the reflected sounds reaches the player 80 with a predetermined time delay, but is radiated upward from the musical instrument 70 and originally should be reflected by the ceiling 50 in the indoor space to reach the player 80. Most of the indirect sound reaches the sound absorber 10 above the performer 80 and is absorbed.

Specifically, a sound going from the instrument 70 to the ceiling 50 is absorbed by the lower surface portion of the sound absorber 10 on the upper side of the performer 80. The sound that reaches the performer 81 from the ceiling side, that is, from above is reflected by a small part of the sound that has not been absorbed when the sound that has reached the lower surface portion of the sound absorber 10 from the instrument 70 is not completely absorbed. Only the sound reaching the performer 80 or the sound that is emitted from the instrument 70 and reflected by the wall or ceiling 50 more than once, and that reaches the performer 80 through the position without the sound absorber 10 with the sound energy greatly attenuated. Thus, the player 80 listens to these sounds.

In this way, after the sound source instrument 70 radiates from the sound source instrument 70 and is reflected once from the ceiling 50, which is the basis for impressing the presence of the low ceiling 50 in the sound field feeling, the sound energy that is still directed toward the performer 80 still remains. A large reflected sound is prevented from reaching the player 80, and only the reflected sound having a low sound energy such as a sound that is slightly absorbed without being completely absorbed by the sound absorber 10 from above the player 80 is played by the player 80. The state of reaching the player 80 is similar to a state in which the upward sound generated from the musical instrument 70 is reflected by a far ceiling surface far away from the musical instrument 70 and reaches the player 80. The sound field feels the same as when performing on a high ceiling stage such as a hall.

Note that most of the sound directed from the musical instrument 70 toward the back of the performer 80 is absorbed by the sound absorber 11 disposed on the back side of the performer 80, and the reflected sound reaching the performer 80 from behind is greatly reduced. Thus, it is possible to prevent the sound field feeling of the performer 80 from being affected by walls, furniture, etc. existing behind the performer 80.

Further, the sound directed to the side or downward from the musical instrument 70 is adjusted in the reflection state by another sound absorbing material separately provided on the wall or floor, and unnecessary reflection that adversely affects the sound field feeling of the player 80. However, this is the same as a known sound absorbing method for walls and floors, and a description thereof will be omitted.

As described above, in the sound field feeling adjusting apparatus according to the present embodiment, the sound absorber 10 supported by the gantry 20 is arranged above the performer 80, and the sound emitted from the sound source is reflected by the ceiling 50 of the room. The sound reaching the player 80 from above is suppressed and the sound reaching the player 80 from above is limited to a weak sound such as the sound from the sound source reflected very slightly on the lower surface of the sound absorber 10. Thus, since the state of the sound reaching the performer 80 from above is the same as a space with a ceiling that is considerably higher than the room, there is a large difference from a performance hall such as a hall, and the factor that makes the performer 80 uncomfortable The sound field feeling based on the reflected sound from the low ceiling 50 in a general indoor space that has been changed to a sound field feeling very close to a demonstration hall such as a hall with a high ceiling can be given to the performer 80. Yes, for practice of performer 80 Ri, the sound field feeling in the room of the general structure is able to provide excellent training environment with no little difference with the demonstration field, Hakare uncomfortable eliminated at the time of demonstration, is linked to the performance improvement at the time of demonstration. In addition, when installing in an indoor space, it is not necessary to renovate the room on a large scale, it can be introduced simply and at low cost, and the sound field 10 can be moved relative to the performer 80 to make the sound field feel easy and simple. It can be adjusted, and the environment for listening to the sound of the performer 80 can be easily improved and an appropriate sound field feeling can be obtained.

In the sound field feeling adjusting device according to the embodiment, the sound absorber 10 is arranged at an upper portion of the column 21 of the gantry 20 and is inclined by 30 ° from a direction parallel to the floor 60. Not limited to this, the angle of inclination of the sound absorber may be different, or the sound absorber may be arranged in a direction parallel to the floor. Further, as shown in FIG. 4, the sound absorber 12 can be arranged so that the inclination angle can be adjusted at the upper part of the column 23 of the gantry 20, and the situation of the indoor space, the type of musical instrument, the head of the subject person, etc. Depending on conditions such as height differences, the sound absorber 12 is adjusted in a direction parallel to the floor or in a predetermined tilted direction within a tiltable range so that it can be a target player such as a player in any situation. In addition to providing a feeling of sound field that is very close to the performance venues such as halls, it is possible to finely adjust the sound field feeling assuming the planned performance venue, and build a practice environment corresponding to various performance situations Available.

Moreover, in the sound field feeling adjusting apparatus according to the embodiment, the sound absorber 10 on the support column 21 of the gantry 20 is configured to have a fixed height. In addition, the length of the support 24 for mounting the sound absorbing body 13 on the gantry 20 can be adjusted, and the height of the sound absorbing body 13 can be adjusted along with the adjustment of the length of the support. In accordance with conditions such as the height of the ceiling and the difference in the head height of the subject, the height of the sound absorber 13 is appropriately adjusted within a range in which the length of the column can be changed, A sound field feeling very close to a demonstration hall such as a hall can be given, and the range in which the position of the sound absorber 13 can be moved with respect to the subject can be widened to increase the adjustment allowance, and a more appropriate sound field feeling can be easily obtained. .

Moreover, in the sound field feeling adjusting apparatus according to the embodiment, the sound absorber 10 is arranged in a fixed state with respect to the upper portion of the column 21 of the gantry 20, but is not limited thereto, and is shown in FIG. As described above, the sound absorber 14 is slidable and moved back and forth with respect to the portion of the pedestal 20 where the sound absorber 14 is supported in a state where the sound absorber 14 extends forward. The position of the sound absorbing body 14 in the front-rear direction can be changed within a supportable range, and the sound field feeling given to the target person such as the performer can be finely adjusted. A sound field feeling close to the desired demonstration hall can be obtained with certainty.

Furthermore, in the sound field feeling adjusting device according to the embodiment, the sound absorber 10 is supported above the head of the performer 80 and the sound absorber 11 is supported by the mount 20 on the back side of the player 80, respectively. In addition to this, as shown in FIGS. 7 and 8, the sound absorber 15 supported by the pedestal 26 can also be arranged at a place on the side of the performer. The sound that is reflected on the side wall of the performer or the sound that is reflected off the wall and directed toward the performer from the side is absorbed by the sound absorber 15, and the reflected sound that reaches the performer from the side wall is received. As a result, it is possible to prevent the influence of the wall or furniture on the side of the performer on the player's feeling of the sound field. In this case, it is preferable that the direction of the sound absorber 15 can be adjusted so that the sound field feeling given to the subject such as the performer can be finely adjusted so as to be close to the performance place desired by the subject.

(Second embodiment of the present invention)
A second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, an example of a large instrument such as a piano, which is fixedly installed on the floor and has a musical sound generation site slightly away from the performer, and a device arranged corresponding to the performer. explain.

In each of the drawings, the sound field feeling adjusting device 2 according to the present embodiment includes the sound absorber 30 and the gantry 40 as in the first embodiment. On the other hand, the gantry 40 has a rectangular frame as a different point. It is formed in an upright state at predetermined intervals on the left and right sides, and its upper part is connected by a beam member to form a unitary combination. A substantially plate-like sound absorber 30 is attached to the upper part, and at the side of the instrument 71 The sound absorbers 31 and 32 are also attached to the left and right frame portions that are in the standing state, respectively, and the

sound absorbers

30, 31, and 32 are disposed so as to surround the performer and the musical instrument 71 from above and from the left and right. .

The sound absorbers 30, 31, and 32 are formed as substantially plate-like bodies having sound absorbing properties, as in the first embodiment, are attached to the upper and side portions of the gantry 40, and face the musical instrument 71 of the performer. The configuration is such that the musical instrument 71 is disposed in front of the front portion. The sound absorbing properties of the

sound absorbers

30, 31, and 32 are based on a known configuration similar to that of the first embodiment, and will not be described in detail.

Among the

sound absorbing bodies

30, 31, and 32, the sound absorbing body 30 attached to the upper portion of the gantry 40 is oriented in parallel with the floor 60, and the height thereof has a sufficient interval that does not contact the musical instrument 71 on the lower side. Therefore, it is necessary to set the range within the room without being in contact with the ceiling 50. For example, it is preferably about 1800 to 2000 mm.

In addition, the size (area) of the upper sound absorber 30 is related to the mounting relationship with the gantry 40 that straddles the musical instrument 71, the mounting workability of the sound absorber 30, the strength and size of the gantry 40 that supports the sound absorber 30, and the like. From the realistic conditions, it is preferable to set the width of the sound absorber to 1600 to 1800 mm and the depth (dimension in the front-rear direction) to about 600 to 1800 mm. However, the optimum value of the height, size, and angle of inclination of the sound absorber 30 varies depending on the structure of the room, the sound pressure of the sound emitted from the sound source, and the subject such as the performer. Therefore, it is necessary to adjust to an appropriate state.

The sound absorber 30 is supported so as to be present above the musical instrument 71 above the performer's head with respect to the musical instrument 71 as a sound source, so that the sound from the musical instrument 71 is temporarily on the ceiling 50. The sound absorber 30 is located just in the middle of the shortest propagation path when reflected and reaches the performer's ear. The sound absorbing action of the sound absorber 30 absorbs the sound going to the ceiling at the lower surface portion of the sound absorber 30 in the middle of the propagation path, or the sound reflected by the ceiling is absorbed by the upper surface portion of the sound absorber 30 in the middle of the propagation path. As a result, the arrival of the sound from the ceiling side, that is, from above, to the performer is greatly suppressed.

On the other hand, the

sound absorbers

31 and 32 on the left and right of the gantry 40 are sized so as to cover the frame portion of the gantry 40 while corresponding to the arrangement position and size of the upper sound absorber 30. The dimensions are set to about 1800 to 2000 mm, and the depth (front-rear direction dimensions) is set to about 600 to 1800 mm.

The gantry 40 is disposed in a place where it does not come into contact with a player who is a sound field adjustment target or a musical instrument 71 located in front of the gantry, and in particular, two left and right frames that stand substantially vertically. The parts including the

sound absorbers

31 and 32 attached thereto are arranged on the left and right sides of the musical instrument 71 and separated from the musical instrument 71 by a predetermined distance. At the lower ends of the left and right frame parts, there is provided a foot part 41 that protrudes sideways and contacts the floor to prevent the standing frame part from tilting left and right or falling over. preferable.

Also, other equipment such as lighting equipment, a camera, and a microphone can be attached to the top of the gantry 40 for use.

Next, the installation and use state of the sound field feeling adjusting apparatus according to this embodiment will be described. As a premise, for the front and rear of the performer, measures are taken in advance so that the sound reflected on the wall is not narrow and the room has a unique habit by placing a separate sound absorbing material on the wall of the room. It shall be.

First, the gantry 40 is disposed at a position near the performance position of the performer as the target person and not in contact with the performer or the musical instrument 71 as the accessory. Specifically, the frame parts of the gantry are respectively arranged on the left and right sides of the musical instrument 71 on the floor surface, and the beam members are arranged so as to straddle the musical instrument 71 above these frame parts. Are connected to form an integrated gantry 40. Furthermore, if the

sound absorbing bodies

30, 31, and 32 are attached and fixed to the upper part and the left and right parts of the gantry 40, the sound field feeling adjusting device 2 can be handled integrally. In this state, the player moves the position of the entire apparatus while making the sound of the musical instrument 71, and finely adjusts the positions of the

sound absorbers

30, 31, 32 with respect to the player. The feeling is in a desired state.

When the player 81 plays the musical instrument 71 with the sound field adjustment device 2 provided, the sound generated from the musical instrument 71 as a sound source diffuses to the surroundings, and the direct sound reaches the player and is reflected by a wall or the like. However, the indirect sound, which was supposed to reach the performer by being reflected from the ceiling 50 in the indoor space, is radiated upward from the musical instrument 71. The sound absorbing body 30 above the musical instrument 71 is reached and most of the sound absorbing body 30 is absorbed.

Specifically, a sound that is going from the musical instrument 71 to the ceiling 50 is absorbed by the lower surface portion of the sound absorber 30 in the middle of the propagation path, or a sound that is reflected by the ceiling 50 and goes toward the performer. Sound is absorbed by the upper surface portion of the sound absorber 30 in the middle. The sound reaching the performer from the ceiling side, that is, from above, is reflected by a small part of the sound that has not been absorbed when the sound that has reached the lower surface portion of the upper sound absorber 30 from the instrument 71 is not completely absorbed. Only the sound that reaches the performer, or the sound that is emitted from the instrument 71 and reflected by the wall or ceiling 50 more than once and that reaches the performer through the position without the sound absorber 30 with the sound energy greatly attenuated. The performer will listen to these sounds.

In this way, after the sound source instrument 71 radiates from the sound source instrument 71 and reflects once on the ceiling 50, which is the basis for impressing the presence of the low ceiling 50 in the sense of sound field, the sound energy is still high, going directly to the performer. The state where the reflected sound is absorbed by the upper sound absorber 30 and only the reflected sound with low sound energy such as the sound emitted from the musical instrument 71 and slightly reflected by the sound absorber 30 reaches the performer. A sound with a high ceiling, such as a hall or the like, is approximated to the state in which the upward sound emitted from 71 is reflected by a far ceiling surface far away from the instrument 71 and reaches the performer. You can feel the same sound field as you do above.

In addition, the sound directed from the musical instrument 71 toward the left and right side walls and the like is largely absorbed by the inner surfaces of the other

sound absorbing bodies

31 and 32 attached to the left and right frame portions where the gantry 40 is erected. The sound reflected on the wall or the like and directed toward the performer is absorbed by the outer surfaces of the

sound absorbing bodies

31 and 32, and the reflected sound reaching the performer from the side is greatly reduced. It is also possible to prevent the sound field feeling of the performer from being affected by walls and furniture existing on the side of the performer.

Note that the sound from the musical instrument 71 toward the front, rear, and downward as viewed from the performer is adjusted in the reflection state by another sound absorbing material separately provided on the wall or floor, which adversely affects the player's sound field feeling. Such unnecessary reflection is not generated, but this is the same as a known sound absorbing method for walls and floors, and a description thereof will be omitted.

As described above, the sound field feeling adjusting device according to the present embodiment is located at a position above the performer, which is in the middle of the propagation path from the sound from the musical instrument 71 as the sound source reflected by the ceiling 50 to reach the performer. The sound absorber 30 supported by the gantry 40 is arranged to suppress the sound emitted from the sound source from being reflected by the ceiling 50 of the room and reaching the performer as it is, and the sound reaching the performer from above is suppressed. Since the sound from the sound source is limited to a weak sound such as a slight reflection on the lower surface of the sound absorber 30, the player performs a demonstration such as a hall with a high ceiling as in the first embodiment. It can provide a sound field feeling that is very close to the venue, and can provide an excellent environment in which the sound field feeling is almost the same as the demonstration hall even in a general structure room. Cause a sense of incongruity with the difference in sound field There.

In the sound field feeling adjusting device according to each of the above embodiments, when the musical instrument played by the performer as the target person is a sound source, the reflected sound in the indoor space of the sound emitted from the musical instrument reaches the performer. It is configured to change the state with a sound absorber and adjust the player's sense of sound field so that the player can practice the performance while having a sound field feeling similar to that of the demonstration hall. For a sound source that is not a musical instrument or a singer himself, away from the subject who is not a performer or singer, it is arranged near the subject and changes the state in which the reflected sound in the indoor space reaches the subject. It is also possible to adjust the sound field feeling of the target person. By using this apparatus, the target person who is not a performer or a singer obtains a sound field feeling close to a hall or the like while in the room, for example. Listening to the performance or singing of others or the sound output from the speakers It is also possible.

The sound field feeling adjusting device according to the present invention is installed in an indoor space, and in a state where the musical instrument is played, it is possible to give a sound field feeling very close to a performance place such as a hall to the performer of the musical instrument as the target person. The measurement evaluation for confirming the sound absorption performance is carried out, and the result compared with the measurement result in the indoor space in the apparatus non-installation state as a comparative example will be described.

The sound field adjustment device according to the present invention is appropriately disposed in an indoor space, and when the performer plays a musical instrument, the waveform changes with the passage of time of sound at a height position corresponding to the player's ear position. (Time waveform) was measured. The instrument was measured for each of a guitar and a piano. In the case of a guitar, the sound absorber was placed above the performer as shown in the first embodiment. In the case of a piano, as shown in the second embodiment, the sound absorber was placed above the musical instrument above the performer for measurement. After the measurement, the frequency component (frequency spectrum) was obtained from the time waveform of the sound by fast Fourier transform.

In addition, as a comparative example, when the sound field feeling adjusting device was not provided in the indoor space, measurement was performed with the same positional relationship except that there was no sound absorber in the same musical instrument performance state, and the frequency component was similarly obtained. .

The graphs of the time waveform of sound over a predetermined time and the frequency components (frequency spectrum) obtained by each measurement when the sound field feeling adjusting device of the present invention is provided in an indoor space are shown in FIG. FIG. 14 shows the case of a piano. Furthermore, the time waveform of the sound and the graph of the frequency component obtained by each measurement when the sound field feeling adjusting device as a comparative example is not provided are shown in FIG. 13 for the guitar and in FIG. 15 for the piano. Each is shown. In each figure, the upper graph shows the time waveform of the sound, the horizontal axis is time, and the vertical axis is amplitude. Note that the waveform measurement time is shown longer in the comparative example, and the waveform is compressed sideways accordingly. The lower graph shows frequency components (20 to 20 kHz), with the horizontal axis representing frequency and the vertical axis representing sound level.

From the above figures, in both guitar and piano, as a comparative example, according to the measurement results when no device is provided in the indoor space, the obtained waveform is finely disturbed, the volume of the sound is also large, It also includes sounds of various frequencies, and corresponds to a state in which the sound is not clear but feels noisy. From the waveform, it can be seen that the reflected sound from various directions is added to the direct sound from the sound source as noise, and the sound field feeling at this time is influenced by the presence of a low ceiling.

On the other hand, according to the measurement result when the sound field feeling adjusting device of the present invention is provided in the indoor space, the reflection from above is suppressed, so that the waveform obtained is sufficiently smooth in the same time width, and the sound It can be seen that the noise level is also quieter with the noise component suppressed, and that the direct sound ratio where the pure harmonic component of the instrument appears is relatively increased from the frequency component. Becomes clear. The sound field feeling at this time is not affected by a low ceiling, that is, corresponds to a state where the ceiling is at a sufficiently high position.

Thus, by using the sound field feeling adjusting device of the present invention, the effect of sound reflection in the installed indoor space is suppressed, and the ceiling is sufficient even in a general indoor space with a low ceiling. It is obvious that the subject can be given a sound field feeling similar to that in a high space, and the environment for listening to the sound of the subject listening to the sound from the sound source can be easily improved.

DESCRIPTION OF

SYMBOLS

1, 2 Sound field feeling

adjustment apparatus

10, 11

Sound absorber

12, 13, 14, 15 Sound absorber 20 Base 21 Strut 22

Base 22a Caster

23, 24, 25, 26

Strut

30, 31, 32 Sound absorber 40 Base 41 Foot Department 50 Ceiling 60

Floor

70, 71 Musical instrument 80 Player

Claims

Between the ceiling and the floor in the indoor space, the direction parallel to the floor or inclined within the range of ± 30 ° from the direction, above the head of the subject who listens to the sound from the sound source, and A substantially plate-like sound absorber disposed at a midway position in the shortest propagation path until the sound from the sound source is reflected by the ceiling and reaches the ear of the subject;
A sound field feeling adjusting device comprising at least a gantry for supporting the sound absorber from below.
In the sound field feeling adjusting device according to claim 1,
A sound field feeling adjusting device, wherein the sound absorbing body is arranged so that an inclination angle can be adjusted.
In the sound field feeling adjusting device according to claim 1 or 2,
A sound field feeling characterized in that one or a plurality of sound absorbers different from the sound absorber are detachably installed at a position corresponding to a rear part and / or a side part of the position where the subject is present in the gantry. Adjustment device.
In the sound field feeling adjusting device according to any one of claims 1 to 3,
The platform is disposed on the rear and / or side that does not contact the subject and the accessories handled by the subject;
A sound field feeling adjusting device, wherein the sound absorber is attached to an upper part of a gantry.